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Zinc bis [12-hydroxyoctadecanoate] is an off-white, odourless powder with a melting point of 150 °C. The decomposition of zinc bis [12-hydroxyoctadecanoate] started at 320°C before boiling. Thus, a boiling point could not be determined. The relative density of zinc bis [12-hydroxyoctadecanoate] is 1.15. As the substance is a salt with a melting point of 150°C, vapour pressure can safely be assumed to be negligible, i.e. below the level of relevance (10-5 Pa). Zinc bis [12-hydroxyoctadecanoate] is a surface-active substance. The water solubility of zinc bis[12 -hydroxyoctadecanoate] is <0.01 to 1.69 mg/L depending on test conditions, resulting in zinc concentration of 176.0 µg/L. The partition coefficient of this substance is not considered to be relevant. Zinc bis [12-hydroxyoctadecanoate] is not flammable. Flash point, explosive properties, self-ignition temperature, oxidising properties, stability in organic solvents and identity of relevant degradation products as well as dissociation constant and viscosity are not relevant for this substance in accordance with column 2 of the respective sections of Regulation (EC) No 1907/2006, Annexes VII to IX or Annex XI, section 1. The granulometry of a representative test material is summarized as follows:

D10 = 0.7 µm

D50 = 8.4 µm

D90 = 38.9 µm

Zinc bis[12 -hydroxyoctadecanoate does not need to be classified for physico-chemical properties, neither according to Directive 67/548 EEC nor to CLP Regulation (EC) No 1272/2008:

zinc bis[12 -hydroxyoctadecanoate] is not flammable;

explosive properties are considered non-relevant based on lack of explosive properties;

oxidising properties are considered non-relevant based on the chemical structure.

The structural analogue substance "Fatty acids, C16-18, zinc salts (CAS# 91051-01-3), relevant for read-across to zinc bis[12 -hydroxyoctadecanoate],

was subject of a EU Risk Assessment. Conclusions from EU RAR Zinc stearate (CAS# 91051-01-3, CAS# 557-05-1) Part I - Environment (Final report R074_0805_env, May 2008; are in line with the conclusions for zinc bis[12 -hydroxyoctadecanoate]:

“Data on boiling point, vapour pressure, and surface tension were not provided. In view of the nature of the substance determination of these parameters is considered to be irrelevant. Information on flammability, explosive properties and oxidizing properties is not available. However, on theoretical considerations the compound is concluded to be not flammable, not explosive and not oxidizing.”